Two-cycle explosion-engine.



.11. R." SIEVERKRQPP. Two-CYCLE EXPLOSION ENGINE.

APPLICATION FILED 00T.11, 1909. z

Patented 1380.20; 1910.

amai/f proved engine eliminates the necessity of l -nection with the crankcase, but there is prothe airunder compression flows.

I'ments in explosion engines'and more espenectedtogether for simultaneous*action by a' compression v isconductedwto the explosion into the 'other cylinder' bya constantly open engine is located in' `cylinder other thanl companying drawings 'forming a part `of this specification, in whichdrawings-V-l UNITED STATES PATENT onirica.

HENRY n.' sinvnnxnorr,

or DAVENPORT, IOWA.

TwofcycLE AEXPLosioN-niaeine. 1

Tol all whom t may concern; u

Be it known that I,rv HENRY R. SIEVER- i inorr, a citizen of 4the-United States, residing at Davenport, in the county of Scott and Statejof Iowa, haivefinventeda newl and use- This Vinvention has reference to improvecially ltwocycle explosion" engines, and it is the object off` the present 'invention to inipi'ove the scavenging actionof an`engine of this type, to eliminate the crank case intake and compression. and ,toy-avoid' waste of the fresh charge by escapeof.- the same through the exhaustsy port. '.Fu-'rtherniore the l iinj stuffing boxesand the construction is'k such that -but one pitnian is needed for two pis# tons.

In accordance with the present'invention there are provided two cylinders `spaced apart, but ifdesired formed in one'- casting and -withinthe cylinders work pistons conpin to which is coniiectedone end of the:l pitman' whilefthe 'other end of the latter is connected to thecrank of the power shaft of thev engine.

AThe interior of the cylinders has no vconvided an arrangementot` ports and connecting conduits wherebythe ends'of the cylinde 1s i'einote from the'explosion chamberconsti ute compression chambers from whichv the air or asuitable yexplosive mixture after end 'of one of "t'hecylinders vand will How passage betlwgenthe explosionends of the two cylinders, while the exhaust p'ort for the the one into which th xplosive mixture Lor The invention-"Willbe best understood from a consideration-of the following detail description taken in connectionwith the ac- Figure 1 is 'a 'central section" threuglith@ engine in the plane'"of,thefxloiigitudinal .axis of the power shaft, the'sectional plane also coinciding with-p the. (':entralzE longitudinal axes vof the cylindersy I shaft 15, vided for each end ofthe crank shaft. The p .y g, 2,is'.a section similar to tv hevsection of,y 1 but omitting base 13 may Y.Specnficaton of Letters Patent. H1;r1131ited DeZOI, 1910, nppiiatioa inedV october 11, v190e.' i serial NQ. 522,029.

the crank caseand the pistons andpitman.` Fig; is asection on theline A-Bof Fig. 2. lteierring tothe drawings there is shown apart to provide an intermediate chamber 3, preferably though not necessarily closedl at the portions 'not closed in bythe cylinders. The explosion chamber end of the cylinders is providedwi-th a suitable waterjacket, al,

-'an engine having two cylinders 1, 2, which x may he 4termed in one casting but are spaced the construction of. which does not enter,

intothe present invention and need not be vspecifically described. The head oi each cylinder 'is entered by a passage 5 for the insertion into the cylinder of a'sui'table spark plug or other type of igniter, but -asthis l toi-nis no part ofthe present invention, the -igniter has been omitted from .the drawings.

Leading from the interior of each cylinder 1, 2, to the interior of the chamber 3 is a slot-G extending longitudinally vof the cylinder -and one slot matching the other. In each cylinder there is a piston 7 of the trunk type except that it may be more lelongated while packing rings S, are provided near the closed end of the piston and also near the open end thereof. "The piston is of such,` length as to always maintain the slotsl of ,the respective cylinders closed to the explosion end Vor theother end of the cylinder.

Extending diainetiically through each piston at -a point.- about .intermediate of its ends a cylindrical web 9 having a pas-l sage therethrough diainetrical to the respectire'pieto'ns, this passagelbeing for the purpose ot receiving the corresponding end of' V thefpin 10 extending through each piston and' through the intervening space yof the chamber the pin4 10 also extending through the slot 6. -For the purpose of. in-A troducing the pinpassages 11 may be made at appropriate -points but in matching rela" tion to the outer walls of the two cylinders 1, 2, and ywhile not absolutely essential-these passages may be closed by `Suitable plugs 12, or any other form of closure adapted tov the. purpose may be used. I

The cylinders' 1, 2, maybe `mounted on a t suitable base y13 inclo'sing a chamber 'in which is housed the crank 14: of a crank..

suitable bearings 1-6, 17', being probe litany of the ordinary types 1 so than the usual piston ofexplosion engines and is so formed vas to close the ends of the cylinders l, 2, remote from' the explosion chamber ends thereof. A pitman 15 connects t-lie pin 10 to the crank 1 4.,

In the explosion/ `chamber end of the cylinderfl'is an exhaust port18 solocated as to be uncovered by the piston 7 in the cylinder 1 as it approaches the completion of its 'power stroke.. In the explosion end of the cylinder 2 4is a port l9so located as to be uncovered bythe piston7 in the cylinder 2 cylinder 1 than is the port 19 in the cylinder' 2 so that'on the forward stroke of the respectivepistons, the port 18 will be unclosed before the port19 `is unclosed.

In thel drawings there are shown conduits 20, one on each sideof the cylinder 2 and each leading from a port 19 toanother port 21 at the end of the cylinder 2 remote from the'explosion chamber end thereof. Wlhile in the drawings only one port 19 and one port 21 are shown, two conduits 20 are indicated and it ywill be understood that two ports 19 and two ports 21 are also provided on opposite sides of the cylinder 2.

The ends of the cylinders remote from the explosion chamber ends thereof are provided each with a port 22 -connected by a conduit 23. The cylinder 1 is also provided at an appropriate Apoint so as to be uncovered by the piston within thecylinder when at the complet-ion of its compression stroke, with a port 24 which may constitute a simple air inlet or may be connected to a suitable pipeV o r conduit leading from a carbureter or other source of explosive mixture.

Let it be assumed that the pistons 7 are at the completion of the compression stroke and that the port 24 has been uncovered. Since during the greater portion of the movement of the pistons on the compression stroke the ports 19 have been closed and the port 24 is also closed there is created within the ends of the cylinders 1 and 2 remote.

from the explosion chamber ends, a partial vacuum so that when the port 24 is uncovered there is an' inrush of air or explosive mixture as the case may be which quickly distributes through the corresponding ends of lthe two cylinders because ofthe connect-'f- The com;A pressed explosive charge has become equaling conduit 23 and ports 22.

' ized through the' explosion chamber ends of the cylinders 1' and 2 because-of a common connecting passage 25 at this end of the structure, this passage being unobstructed or.

free between the two cylinders.

In order'that the 'compressed charge may be thoroughly ignited there isl provided ank igniter for each cylinder, although one single igniterwouldanswer because of the free communication between the explosion chaml bers of the two cylinders byway ofthe pasl-sage 25; Now on the ignition of the charge ward the other` ends of the cylinders on the -power 'stroke and the movement is imparted through the -pin-10 and pitnian 15Ito the crank shaft causing the latter-to turn in the ton in cylinder l quickly closes the inlet port 24 and the air or charge imprisoned in the forward vends of the cylinders becomes y compressed because of the movement of the pistons I toward such ends of the cylinders. Before the power stroke is completed the port 18 and a l bustion nd their escape 'therethrough before the ports 19 in the cylinder 2 are uncovered. lVhen this takes place 'there is an intermediate' inrush of thefresh.` charge through the ports 19driving outi'before it the burned gases within the cylinde'r2 and forcing the latter through the passage 25 into the explosion chamber end of the cylinder 1 and out through the now enlarged exhaust port '18. By thetime this has occurred and before any Vof the tresh charge can escape through the exhaust. port 18 the latter has been again closed by the compression stroke of the piston within the cylinder 1.

The engine continues to run in the same manner as an ordinary 't-wo-cycleei'igine but with increased power because of the twin pistons moving simultaneously in the same direction while the comparatively long distance necessary for the mrushing charge to travel before it can reach the exhaust, port causes it to thoroughlyvscavenge both cylinders without any material portion of the freshcharge escaping through the exhaust port or any material portion of the burned gases remaining in the explosion chambers to dilute the fresh charge. Furthermore the compression chambers have less capacity than is the case where the crank case is utilized 4.for the compression kof the fresh charge or of the air to be mixed with the fuel and consequently a higher initial com pression of the incoming charge or air is accomplished and consequent-ly the charge is injected into the explosion chambers with rgreater -force and the scavenging action is of two-cycle engines.

cerned, the crank case 13 may be opento vthe atmosphere or may be entirely omitted. but it is usually desirable to inclose the crank to makethe engine cleanly, to provide .V for the splash lubrication of the crank bearings? and to prevent exposure 'of moving parts more than is absolutely necessary. All moving parts of the engine are inclosed except the ends of the power shaft carrying thebalance wheel and drive pulley and in the pistons are driven-si1nultaneously to-v usual manner. The power stroke of the pis' piston in cylinder 1 uncovers the exhaust' more thoroughthan with the ordinary type` So far as the action of the engine is con- .so ortion of the gases of commost cases both thebalance Wheel and pulley` may be ai the saine end ot' the shaft and under these circumstances the other end of theshaft may be covered.

What is claimed is:

l. An explosion engine'having like cylindersy in parallel relation, said cylinders being spaced apart and interconnnunicating at each end, with both ends of eaclrcylinder normally closed lto the atmosphere and the two cylinders at the adjacent, walls each liaving a longitudinal slot matching that of the 'other cylinder, pistons in the` cylinders, a

eonneetinpl nieniber'for the pistons 'traversingl the slots in the cylinders, an inlet port in one cylinder controlled by one end of the piston inthe said cylinder, an exhaustport 'in the saine cylinder controlled by the other end of said piston, a port at the power end ot' the other cylinder controlled by the pis- 'ton in said other cylinder, the last nained port communicating with theend. of the saine cylinder reinote from the power end', a base or support for the cylinders, a crank sha'ftniounted in said base, and-a pitnian between thel crank shaft and the connecting member for the. pistons, the base consti- .tons in the cylinders connected for nio\ einent simultaneously in the saine direction, an inlet portA in one eylinder controlled by one end ot' the piston in saidrcylinder, an exhaust port in the saine cylinder controlled l by the other end of said piston, and a port at the power endof the other cylinder con trolled by the piston 1n the said other v vlinder, the last named port coninninicatlng with the end of the saine cylinder-remote from the power end.

ln testimony that I clainr the foregoinpl as iny own, I have vhereto affixed my signature in the presence of tiro Witnesses.

HENRY R.` ASIEVERKROPP.

'l`\'it1iesses: i

I. P. SCHWARZ, J. H. KERKER. 

